棕刚玉,金刚砂,刚玉,磨料,耐火材料,白刚玉,抛光砂,研磨砂,精密铸造砂,,亚白刚玉,微晶刚玉,单晶刚玉,致密电熔刚玉,黑刚玉,低碳亚白刚玉,涂料,磨料磨具,半脆刚玉,高铝刚玉,灰刚玉,耐磨耐火材料等.;